This task will provide two requested extensions to numeric.ml:
(1) allow passing an interval value to --range:
numeric --range 0-10 2-5 (passes)
numeric --range 0-10 7-12 (fails)
(2) define an inversion operator for --range:
numeric --range 0-10 !12 (passes)
numeric --range 0-10 !5 (fails)